Clue - Period and ovulation tracker app for iPhone
draw.io - Online diagramming application
Flo Health - The #1 app for women's menstrual health 💆♀️
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Eve by Glow - A savvy sex & health app for women
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.